Why Thickness Of Plywood For Residential Roof

Sheathing should be a minimum of 19 32 inch thick.

Why thickness of plywood for residential roof. After the 1960s the predominant residential roofing substrate became 1 2 cdx plywood. Sheet with varying thickness. The minimum thickness of plywood used for roofing is 3 8 th of an inch. What plywood should you use for a roof.

Why re sheet over shiplap. Most western washington residential homes during this time were built with shiplap roof decks rather than plywood. Look for something that s graded as exposure 1 or exterior. Metal roofing panels rated for architectural use attached to purlins horizontal pieces of wood or metal fastened to roofing trusses are structurally sound when installed according to your roofing manufacturer s instructions and local building codes.

For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. 8d ring shank nails should be used instead. This kind of plywood can be used on roofs with minimal load. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.

Plywood typically comes in 4 8 ft. Today a shiplap roof is usually 60 years old. The typical thickness range for sheathing is 3 8 to 3 4 inch. What size plywood should you use for your roof.

The industry offers a thickness of anywhere from 5 16 inch to inch. So what size plywood should you use for your roof. Osb and plywood come in thicknesses ranging from 5 16 to 3 4 inch and the thickness needed for a particular roof depends on several factors including rafter spacing expected load and roof design. Osb is made of small and fairly rectangular shaped wood chips from small resinous trees which are bonded into a panel form with wax and synthetic resin.

Because 22 24 or 26 gauge sheeting is thicker and will therefore remain more structurally sound over a longer span than a 29 gauge the building needs fewer supports which saves your customers money. Plywood on the other hand is made with thin sheets of wood that have been cut from a spinning log then glued together. Steeper rather than flatter roofs will have lesser load per sq. Foot and with a maximum of spacing of 16 inches between rafters.

Post frames generally lack structural sheathing so the roof and wall panels must span between the supporting trusses or purlins. Especially in relation to osb or plywood use for roofs walls floors. Regardless of thickness the plywood should be a type suitable for exterior use graded exterior or exposure 1 references. Never attach roof sheathing with staples.

When used for roofing plywood panels are covered and protected by a variety of building materials that keep the elements at bay including roof felt underlayment flashing and shingles.